I'm working on a project and need a red led to slowly glow to full brightness and when full on I need a white LED to light and both LEDs to go out at the same time. It doesn't have to be a repeating cycle

I've only done simple 555 and 4017 led chaser circuits so this effect is beyond me.

Not exactly as requested , but it's a start.Adjust R5 so full red LED brightness is reached by end of 10 sec timing cycle when 1/2 sec 555 is triggered to turn on white LED. D4 adjusted to give rapid discharge of C2.

Not exactly as requested , but it's a start.Adjust R5 so full red LED brightness is reached by end of 10 sec timing cycle when 1/2 sec 555 is triggered to turn on white LED. D4 adjusted to give rapid discharge of C2.

I'm trying to get the effect of a star trek photon torpedo launcher from the 1st movie. red building to intensity and a white flash at fire. There is a prebuilt lighting circuit for it, but I'd rather build it myself.

To shorten C2 discharge time, use an N-ch FET with an RC delay on gate, 2/10 th sec or less depending on burst time. To change C2 charging from expotential to linear try a constant current source ,replacing R4, such as LN334 adjusted for about one mA.

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“Electrical science has disclosed to us the more intimate relation existing between widely different forces and phenomena and has thus led us to a more complete comprehension of Nature and its many manifestations to our senses.”